Thermic telephone



PIETER DE LANGE AND ROBERT AERNOUT BA R ON VANLYNDEN.

THE'RMI C TELEPHONE. APPLFCATION FILED NbV. 4. ]9l 5.

I Jamiars Pieterdelu e and Egbert Jemaalfiron rigk m UNITED STATES PATENT OFFICE.

PIETFR DE LANGE AND ROBERT AERNOUT BARON VAN LYNDEN. vOF UTRECHT, NETH- ERLANDS. ASSIGNOBSv BY MESNE ASSIGNMENTS, TO AMERICAN THERMOZPHONE COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

Application filed November 4, 1915.

1' 0 (ZZZ 12:72am it may concern Be it known that we, Pnrrnn DE LANGE and Annnonr BARON VAN LYNDEN, both subjects of the Queenot the Netherlands, and residing at Utrecht, in the Netherlands, have invented a new and useful Thermic Telephone, of which the following is a speufication.

Our invention relates to thermic telephones and its object is to provide a thermic telephone which is adapted to be carried upon the person, without a cord, and may be connected to any socket of a telephone system in a house, etc.

According to our invention the thermio telephone is provided with two external plugs mounted on its casing and serving to conne"t it to the sockets of a system. Consequentlv, the user of the telephone need carry with him only the telephone proper. Formerly. such telephones had more or less long cords which are not only troublesome when carried in a pocket but also increase not inconsiderably the cost of the telephone.

Ret'erence is to be had to the accompanying drawings in which an example of our invention is shown. Figure 1 is an elevation of a thermic telephone constru ted in accordance with our invention, Fig. 2 is also an elevation of the same. but seen at right an les to Fig. 1, and partly in section, Fig. 3 illustrates the connection of the therrnic te ephone to a socket. Figs. 4 and 5 are seetions taken respectivelv on line A-B in Fig. 3 and on line CD in Fig. 4. both on an enlarged scale, and Fig. 6 illustrates a manner of carrying the thermic telephone.

Referring to Figs. 1 and 2. the thermic telephone re eiver 1 illustrated therein is of the well known construction and of a size enablin it to be introduced directly into the auditory passage of the human ear. The said receiver preferably has at one end a disk-like body 1 with a flat outer surface. The telephone is provided with two external contact plugs 2 mounted directly on the easing adjacent to said fiat-faced end or head and conductively connected to the heating wires inclosed within the telephone. The contact plugs 2 are preferably rigid and provided with spherical heads which may receive between them an exchangeable sus- Specification of Letters Patent.

Patented Feb. s, 1921.

Serial No. 59,627.

pension hook 3, by means of which the thermic telephone may be suspended from a pocket, for example, of the waistcoat, as illustrated in Fig. 6.

WVhen the telephone is to be used, its plugs 2 are inserted into a socket 4, preferably having a flat surface adapted to engage the similar surface of the receiver end 1'. Such sockets are suitably distributed over the telephone system and preferably provided with conductor cords 5 of such length as to enable the telephone to be conveniently connected.

A suitable construction of a socket is illustrated in Figs. 4 and 5. It comprises an an nular casing 6 provided with openings 7 for the insertion of the plugs 2. The casing 6 is closed by a cover 8 having two crescentshaped projections or bridges 9 which extend into the hollow space of the casing 6. Between the bridges 9 and the inner Walls of the casing 6 are arranged two arc-shaped springs 10, the ends or hooks 11 of which project inwardly slightly beyond the circumference of the openings 7. Connected to the springs 10 are the two current conductors 12 of the cord 5, which lie between the said springs and the bridges 9 and are passed to the outside through a lateral opening 13 of the casing 6. The springs 10 are held in position by means of lateral screws 14. The two parts 6 and 8 of the so"ket are held together by means of screws or the like, not shown.

WVhen the contact plugs 2 are pushed into the insertion openings 7 of the movable socket 4 they force the ends ll of the arcshaped springs 10 outward. The end portions 11 of the springs 10 are practically of the same width as the chamber of the casing 6. see Fig. 5, so that these spring ends will always engage the outer or opposite faces of the ball heads 2, see Fig. 3, thus enabling socket into' which the said free ends are adapted to extend, said socket comprising a casin brid es located therein and s aced from the inner surrounding wall of the cars ing, and current-conveying springsextending within the casing between said bridges and said inner wall and having movable portions adapted to engage the free ends oi said plugs.

2. In a portable telephone, a telephone casing provided with conducting plugs projecting therefrom, and a socket into which said plugs are adapted to extend, said socket comprising a casing, current-conveying springs arranged withinthe socket casing and adapted to engage said plugs, wires for connecting said springs with a circuit, and screws having the double function of securin said springs andof vmaking contact with and wires.

3. 1n a thermic telephone, a casing, a

pair of contact plugs provided with heads mounted on said casing, said contact plugs and heads adapted to extend the talking circuit, said heads also providing a restricted opening whereby the casing maybe supported.

4. In a portable telephone, a telephone casing provided at one end with projecting conducting plugs having enlargements, and a socket intowhich-said plugs are adapted to extend, said socket comprising a casing, bridges located therein and spaced from the inner surrounding wall of the casing, and current-conveying springs extending within the casing between said bridges and said inner wall and having movable portions adapted to engage the enlargements of the said plugs. H

In testimony whereof we have signed this 7 specification.

PIETER dc LANCE. r 7 7 ROBERT AERNOUT BARON van LYNDEN. 

